What is the difference between PET/MR and PET/CT
Detailed information on the differences between these examinations is presented on a dedicated subpage comparing examinations. The PET/MR examination is a multiparametric examination, which means two examinations in one, i.e. positron emission tomography examination and fully diagnostic 3-Tesla magnetic resonance imaging. By overlaying the images, the patient and their doctor receive more information that can help in making a diagnosis. In the case of PET/CT examinations, computed tomography is only auxiliary and is not fully diagnostic. In addition, the PET/MR examination is characterized by a much lower dose of ionizing radiation. For more information, please visit the subpage.
Could everyone perform PET MRI examination?
Each time a decision about qualifying a patient is made by a medical doctor based on a medical history. According to our standards, patients receive a free qualification of a doctor specializing in nuclear medicine. It should be remembered that each PET MRI examination is associated with exposure to ionizing radiation (although the exposure is minimal, ionizing radiation should be used only in justified cases). In such cases, the ALARA principle is used – as low as reasonably achievable (as small doses of ionizing radiation as reasonably possible). Always diagnostic or therapeutic benefits obtained using an isotope must overcome the risk of exposure to ionizing radiation. Therefore, our specialists will evaluate and indicate the most beneficial diagnostic tests from the point of view of the patient’s health.
Is exposure to ionizing radiation in the PET MRI test is high?
No, because the doses of radiopharmaceuticals are selected individually for each patient (calculated on the basis of body weight – 4 MBq / 1 kg of body mass). We give the lowest possible doses of radiotracers, but sufficient to achieve the expected diagnostic benefits. When exposed to ionizing radiation and the selection of isotope doses, the ALARA principle is used – as low as reasonably achievable (as small doses as reasonably possible). In the case of PET / MRI studies, there is no additional exposure from magnetic resonance to ionizing radiation (in contrast to hybrid tests using PET / CT computed tomography). In addition, the unbound isotope is quickly excreted from the body mainly in the urine. The 18F isotope used for the study has a relatively short physical half-life – 110 minutes, i.e. after that time, half of the given radiotracer activity in the body becomes 220 min. there is already ¼ of the initial amount and so up to the complete decomposition of the radiotracer. According to the principles of radiation protection, it is assumed that after 10 half-lives (T1/2), the marker disintegrates completely.
Can I drive after the test?
Yes, after the examination without general anesthesia, you can perform all daily activities, this also includes driving a car. Just remember to drink water (about 5 glasses) to help flush out the radioactive substance.
Do I have to stay in the hospital overnight for an examination under general anesthesia?
There is no need. A PET/MR examination under general anesthesia is performed in the presence of an anaesthesiology specialist, however, it is still an outpatient examination, which means that the patient goes home on the same day.
Can the examination cause claustrophobia?
This is possible because being in a confined space can cause anxiety or discomfort. To prevent this, you can ask your doctor to give you a sedative or perform an examination under general anesthesia.
How long will I be a source of radiation?
Very low levels of radiation last for about 6-12 hours, up to a maximum of 24 hours.
